Radiation detector suitable for a pulsed radiation source

Abstract

Disclosed herein is a radiation detector, comprising: a plurality of pixels, and a controller; wherein each pixel is configured to detect radiation emitted from a pulsed radiation source; wherein the pulsed radiation source is configured to emit radiation during a plurality of ON periods and configured not to emit radiation during a plurality of OFF periods; wherein the controller is configured to determine that the pulsed radiation source is at one of the ON periods or at one of the OFF periods; wherein the controller is configured to cause the pixels to integrate signals or not to integrate signals with determination that the radiation source is at one of the ON periods or at one of the OFF periods.

What is claimed is: 
     
       1. A radiation detector, comprising:
 pixels, and 
 a controller; 
 wherein each of the pixels is configured to detect radiation emitted from a pulsed radiation source; 
 wherein the pulsed radiation source is configured to emit radiation during ON periods and configured not to emit radiation during OFF periods; 
 wherein the controller is configured to determine that the pulsed radiation source is at one ON period of the ON periods or at one OFF period of the OFF periods; 
 wherein the controller is configured to cause the pixels to integrate signals with determination that the radiation source is at the one ON period and the controller is configured to cause the pixels not to integrate signals with determination that the radiation source is at the one OFF period; 
 wherein the radiation is X-ray. 
 
     
     
       2. The radiation detector of  claim 1 , wherein the signals during the ON periods comprise signals attributable to radiation from the pulsed radiation source and signals attributable to dark noise. 
     
     
       3. The radiation detector of  claim 1 , wherein the signals during the OFF periods comprise signals attributable to dark noise but not signals attributable to radiation from the pulsed radiation source. 
     
     
       4. The radiation detector of  claim 1 , wherein the controller is configured to cause the pixels to integrate signals during all of the ON periods. 
     
     
       5. The radiation detector of  claim 1 , wherein the controller is configured to cause the pixels not to integrate signals during all of the OFF periods. 
     
     
       6. The radiation detector of  claim 1 , wherein the controller is configured to process, during the OFF periods, signals of the pixels integrated. 
     
     
       7. The radiation detector of  claim 1 , wherein the controller is configured to digitize, during the OFF periods, signals of the pixels integrated. 
     
     
       8. The radiation detector of  claim 1 , wherein the controller is configured to reset signals of the pixels integrated. 
     
     
       9. The radiation detector of  claim 1 , wherein the radiation detector and the pulsed radiation source are synchronized to a same clock. 
     
     
       10. The radiation detector of  claim 9 , wherein the controller is configured to determine that the pulsed radiation source is at the one ON period or at the one OFF period based on a clock signal from the clock. 
     
     
       11. The radiation detector of  claim 1 , wherein the radiation detector comprises a device configured to detect an intensity of the radiation from the pulsed radiation source as a function of time. 
     
     
       12. The radiation detector of  claim 11 , wherein the device has a lower shot noise than the pixels. 
     
     
       13. The radiation detector of  claim 11 , wherein the controller is configured to determine that the pulsed radiation source is at the one ON period or at the one OFF period based on the intensity of the radiation. 
     
     
       14. The radiation detector of  claim 1 , wherein the controller is configured to determine that the pulsed radiation source is at the one ON period or at the one OFF period, using the pixels. 
     
     
       15. The radiation detector of  claim 14 , wherein the controller is configured to determine that the pulsed radiation source is at the one ON period or at the one OFF period, based on a combined signal of a plurality of the pixels. 
     
     
       16. The radiation detector of  claim 1 , wherein exposure of the pixels to the radiation is synchronized. 
     
     
       17. A system comprising the radiation detector of  claim 1  and the pulsed radiation source. 
     
     
       18. The system of  claim 17 , wherein the system is configured to perform X-ray radiography on human chest or abdomen, to perform X-ray radiography on human mouth, to form an image using backscattered radiation, or to form an image using radiation transmitted through an object inspected. 
     
     
       19. The radiation detector of  claim 1 , wherein the controller is configured to cause the pixels to integrate the signals during two neighboring ON periods without resetting the signals between the two neighboring ON periods. 
     
     
       20. A radiation detector:
 wherein the radiation detector is configured to detect radiation from a pulsed radiation source; 
 wherein the pulsed radiation source is configured to emit radiation during ON periods and configured not to emit radiation during OFF periods; 
 wherein the radiation detector is configured to determine that the pulsed radiation source is at one ON period of the ON periods or at one OFF period of the OFF periods; 
 wherein the radiation detector is configured to integrate signals with determination that the radiation source is at the one ON period and the controller is configured not to integrate signals with determination that the radiation source is at the one OFF period; 
 wherein the radiation is X-ray. 
 
     
     
       21. The radiation detector of  claim 20 , wherein the ON periods and the OFF periods have adjustable lengths. 
     
     
       22. The radiation detector of  claim 20 , wherein the signals during the ON periods comprise signals attributable to radiation from the pulsed radiation source and signals attributable to dark noise. 
     
     
       23. The radiation detector of  claim 20 , wherein the signals during the OFF periods comprise signals attributable to dark noise but not signals attributable to radiation from the pulsed radiation source. 
     
     
       24. A system comprising the radiation detector of  claim 20  and the pulsed radiation source. 
     
     
       25. The system of  claim 24 , wherein the system is configured to perform X-ray radiography on human chest or abdomen, to perform X-ray radiography on human mouth, to form an image using backscattered radiation, or to form an image using radiation transmitted through an object inspected. 
     
     
       26. The radiation detector of  claim 20 , wherein the radiation detector is configured to integrate the signals during two neighboring ON periods without resetting the signals between the two neighboring ON periods.